There
is therefore no extension of the knowledge of given supersensible
objects, but an extension of theoretical reason and of its knowledge
in respect of the supersensible generally; inasmuch as it is compelled
to admit that there are such objects, although it is not able to
define them more closely, so as itself to extend this knowledge of the
objects (which have now been given it on practical grounds, and only
for practical use). For this accession, then, pure theoretical reason,
for which all those ideas are transcendent and without object, has
simply to thank its practical faculty. In this they become immanent
and constitutive, being the source of the possibility of realizing the
necessary object of pure practical reason (the summum bonum);
whereas apart from this they are transcendent, and merely regulative
principles of speculative reason, which do not require it to assume
a new object beyond experience, but only to bring its use in
experience nearer to completeness. But when once reason is in
possession of this accession, it will go to work with these ideas as
speculative reason (properly only to assure the certainty of its
practical use) in a negative manner: that is, not extending but
clearing up its knowledge so as on one side to keep off
anthropomorphism, as the source of superstition, or seeming
extension of these conceptions by supposed experience; and on the
other side fanaticism, which promises the same by means of
supersensible intuition or feelings of the like kind.
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